The description says:
"A large specialised battleship class ship, the Bombardment Battleship is heavily armoured but incapable of engaging other ships in space. Instead it specialises in bombing specific sites on planets from orbit with high precision plasma weapons, aiding friendly ground forces. "
When you deploy a space fleet, you deploy them at a nebula. There are no space battles at planets so do these ships currently have any effect? Say you deploy a space fleet at the nebula in Talsamar, does it bombard Toylia? What if there were multiple planets infected in the same system? If they were deployed as part of the Air/Land Fleet then their purpose would make more sense but since it's part of the space plans it leaves me more confused.

"A ship with some similarities to the Heavy Carrier, this Battleship Class vessel does not carry Interceptors and Bombers; instead it is used to ship large numbers of autonomous ground and air assault units between planets and deploy them on the planet once there."

I understand that Land/Air forces are designed to work on planets, And two above units are for assaulting strongholds in Nebula. Like US Army + Air Force vs US Marines + US Navy on ancient Earth.

ok thanks. yeah I seem to have 30000000 genesis points by the looks of it I will need a lot more. don't remember how I got them though lol must have been when I was last here. so I need to find a genesis office so I can start getting more points.

you need to find office in system with unfinished planet (so not kelsey, danar, kalerd, iirc). In fact, 30M should be almost enough for small one, but higher valued plots are better in resources production. As you stick to your plot forever - I'd go for high (you can research it later, but it takes a lot of time).